diff --git a/firmware/common/diacritic.c b/firmware/common/diacritic.c
index 15612610d8..1cba32e483 100644
--- a/firmware/common/diacritic.c
+++ b/firmware/common/diacritic.c
@@ -272,7 +272,7 @@ bypass:
     if (is_rtl)
         *is_rtl = ((DIAC_RTL & info) == DIAC_RTL);
 
-    return (char_code < (diac->base + (info & DIAC_CNT)));
+    return char_code < (uint32_t)(diac->base + (info & DIAC_CNT));
 }
 #else /*BOOTLOADER*/
 inline bool is_diacritic(const ucschar_t char_code, bool *is_rtl)